SnCl2/nano SiO2: A green and reusable heterogeneous catalyst for the synthesis of polyfunctionalized 4H-pyrans

SnO nanoparticles: a robust and reusable heterogeneous catalyst for the synthesis of 3,4,5-substituted furan-2(5H)-ones

“…Nanoparticles exhibit good catalytic activity due to their large surface area and active sites which are mainly responsible for their catalytic activity. These advances have opened the door for the design of novel nanocatalysts for particular applications in synthetic chemistry [24][25][26][27][28][29]. Metal oxides represent a broad class of materials that have been researched extensively because of their unique properties and potential applications in diverse fields [30].…”

Highly efficient synthesis of benzopyranopyridines via ZrP2O7nanoparticles catalyzed multicomponent reactions of salicylaldehydes with malononitrile and thiols

“…Due to their high surface-to-volume ratio, which can carry a high payload of catalytically active species, NPs show very high catalytic activity and chemical selectivity under mild conditions. [28][29][30][31][32][33][34][35][36] Neat processes utilizing eco-friendly and green catalysts that can be simply recycled at the end of reactions has received remarkable attention in recent years. We report herein a simple and facile procedure for the synthesis of benzopyrano [ …”

A novel poly(ethyleneoxide)-based magnetic nanocomposite catalyst for highly efficient multicomponent synthesis of pyran derivatives

“…MCR between an aryl aldehyde, malononitriles, and 1,3-dicarbonyl compounds that produce 2-amino-4H-pyrans is widely studied. Some examples of the catalysts used for synthesis are molecular Iodine (16), Ammonia solution (17), Urea (5), MgO (6), Mg/La (18), SiO 2 (19) , SnCl 2 /nano-SiO 2 (20), Cu(II) oxymetasilicate (21), KF-Al 2 O 3 (22), ionic liquids like [2aemim][PF6] (23), C 4 (DABCO-SO 3 H) 2 .4Cl (24), and chitosan-CTAB (25). Most of published reports in the literature suffer from disadvantages such as high temperature, non-recyclable catalyst and long reaction time, use of volatile solvent and tedious work-up procedures.…”